Betting strategy gets blamed for most bust-outs, but the usual culprit is stake sizing. This Bankroll Unit Calculator splits your capital into variance-adjusted units so a normal cold streak doesn’t end your session career. For the full math behind it, read our breakdown of Risk of Ruin.
Bankroll Unit Calculator
The concept: What is a betting unit?
How Does This Compare to 0% House Edge Protocols?
Audited 100% RTP
Instead of standard 1.00% to 4.00% casino house margins, compare with mathematically verified 100% RTP Originals (0.00% House Edge) on Duel Casino:
A betting unit is your standard wager expressed as a slice of total bankroll, not as a dollar figure. Serious bettors count in units. Dollars hide context; units reveal it.
Tell a professional you won $1,000 last night and they learn nothing — was that 0.2 units or 10? Say you won **5 units** and the picture is instant: profit measured against risk taken. Unit sizing also does quiet maintenance work for you. Bankroll up? Your stakes scale up. Bankroll down? Stakes shrink automatically instead of you gutting your capital with flat bets. The Risk of Ruin math shows exactly how quickly the wrong sizing compounds.
How to select your risk profile
The calculator maps your stakes to one of three standard risk profiles. Pick the one that matches how often you bet and how much drawdown you can stomach:
1. Conservative (150 to 200+ Units)
Built to push ruin probability close to zero. A conservative unit runs **0.5% to 1.0%** of bankroll. Choose this if you bet frequently — hundreds of sports wagers per week, or fast-paced blackjack — because high volume means long exposure to variance and you need deep reserves to ride it out.
2. Balanced (100 Units)
The default for disciplined players: **1.0%** of bankroll per unit, no rounding games. It trades some growth speed for dependable downswing protection. The concrete benefit: a 10-bet losing streak leaves 90% of your bankroll intact and you fully in the game.
3. Aggressive (30 to 50 Units)
Units of **2.0% to 3.0%** of bankroll. This profile only fits low-variance strategies or casual sessions where going broke is an acceptable outcome. Hit a patch of cold cards or missed picks at this size and the bankroll enters a spiral that’s hard to arrest — losses grow while capital shrinks.
Data Sandwich: The math of a 5-bet losing streak
Two bettors, Player A and Player B, each start with $5,000. Same games, same picks, same 6-loss streak. Different unit math, very different endings.
- Player A (Balanced): 1% unit size, $50 per bet. That’s 100 units of runway.
- Player B (Aggressive): 5% unit size, $250 per bet. Only 20 units of runway.
Both drop 6 consecutive wagers. Standard variance — nothing exotic.
**Player A** loses $300 total. Bankroll: $4,700, a 6% drawdown, with 94 units still deployed-able. No panic, no changes, just wait for variance to even out.
**Player B** loses $1,500 on the identical streak. Bankroll: $3,500 — a 30% hole. That’s the point where chasing starts: bigger bets to win it back, and the death spiral does the rest.
Frequently asked questions
How often should I recalculate my unit size?
Recalculate whenever your bankroll moves 10% to 20% from its last checkpoint. Growth gets locked in as a larger unit; drawdowns trigger a smaller unit that cushions the fall. A fixed calendar schedule works too — many bettors recheck weekly.
Does game variance change my unit requirements? (Read our breakdown of RTP vs Volatility to understand how variance operates).
Yes, materially. High-variance play — slots, sports parlays — demands 300+ units to survive the dry spells. Low-variance games such as blackjack or single-zero roulette can run safely on 100 units.
What is the difference between static and proportional betting?
Static betting holds the unit at a fixed dollar value no matter the balance. Proportional betting recalculates after every wager, so stakes shrink as you lose — which makes literal ruin mathematically impossible, since bets approach zero before the bankroll does. The tradeoff is the manual arithmetic, which is exactly what this calculator removes.